Add Popup Focus Trap Feature

src/app/i18n/jp.ts

@@ -20,8 +20,9 @@ export const JP: Translation = {
     signup: '新規登録',
   },
   common: {
-    selectOption: '選択...',
+    selectOption: 'オプションを選択...',
     close: '閉じる',
     save: '保存',
+    skipToContent: '本文へスキップ',
   },
 };